[ez]

Then I take it the ISS is also low Earth orbit?

Sorry, but I was of the understanding that only Columbia, being the oldest heaviest craft in the fleet was restricted to low orbit, and that the other shuttles could go farther. And that was why Columbia was reduced to science experiments, while the other shuttles were used to supply ISS.

I'll be back after checking the facts.

[steve-b]

The other shuttles have a somewhat greater range (enough to reach ISS), but they are all limited to low earth orbit.